Ds. Fan et Yb. Pan, SINGULAR INTEGRAL-OPERATORS WITH ROUGH KERNELS SUPPORTED BY SUBVARIETIES, American journal of mathematics, 119(4), 1997, pp. 799-839
In this paper we study the mapping properties of singular Radon transf
orms defined by translates of a subvariety. The singular kernels consi
dered here are of Calderon-Zygmund type, but are allowed to be very ro
ugh both on the unit sphere and in the radial direction. We prove, amo
ng other things, that such singular integral operators are bounded on
the Lebesgue spaces.